We can send an email to the participants of created appointments or events, and we can write a text of our own to remind them or provide further details.

Note: The Xiaomi smartphone automatically selects the added guests when you create an appointment, but you can deselect or remove them.

Android 10 | MIUI 11.0
Invite contacts -  Open  Calendar
Invite contacts -  Select an  event
Invite contacts -  Tap on  Email guests
Invite contacts -  Type a  message
Invite contacts -  Tap on  Send
  1. Open Calendar
  2. Select an event
  3. Tap on Email guests
  4. Type a message
  5. Tap on Send

Xiaomi Instructions